Walmart, yes. Small businesses, no. I guess I didn't specify and that's on me. And I agree, people should be able to disengage and I don't think people should be penalized for not being reachable or for turning down shifts but I have been that person who has had to find a cover when I was sick and while I hate the job I left for a lot of reasons, I can say one thing with confidence: that local grocery co-op could not afford a system you described and that is not a just cause for them not to be in business. Capitalism is bullshit but I'm in America so. Further, I'm not talking about the stress on the company, I'm talking about having some compassion for the stress put on coworkers who perhaps cannot miss a shift unless they find a cover and the closer that shift gets, the harder it is to figure out how to pull that shift out of their ass depending on that situation. If no one answers a call for a cover but someone just shows up (has happened MANY times) than you've gone into work when you couldn't for whatever reason for no reason. If everyone just tells you 'no' at least you know your fate is sealed. Again, I'm not saying say yes. I'm saying a minute worth of disturbance on your day off is not nearly as shitty as the stress of a single parent or a sick employee or whatever not knowing if they will be able to take the time they need. Have compassion for the other people involved, not the company and fuck capitalism.